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A portable, high-pressure, power washing system is described which includes an electric motor driven gear pump where the electric motor is effectively water cooled by virtue of being contained in a thermally conductive housing surrounded by an insulating water jacket through which the water being pu

A portable, high-pressure, power washing system is described which includes an electric motor driven gear pump where the electric motor is effectively water cooled by virtue of being contained in a thermally conductive housing surrounded by an insulating water jacket through which the water being pumped is made to flow before reaching the pump\s inlet port. The pump is driven through a gear reduction mechanism such that a relatively inexpensive, single-phase, series AC (universal) motor normally operating at a high rpm can be employed. By proper dimensioning of the pump chamber relative to the drive and idler gears and by providing a flow divider at the pump chamber\s discharge orifice, high pumping efficiency is obtained. Completing the assembly is a discharge wand for directing the high pressure water at the surface to be cleaned and for controlling the on/off state of the pump\s drive motor.

대표청구항 ▼

A portable pumping apparatus for high-pressure washing application comprising, in combination: (a) an outer, electrically insulating shroud having a liquid inlet port and a liquid outlet port; (b) an inner, single-wall, liquid impervious, motor housing having a hollow interior and generally concentr

A portable pumping apparatus for high-pressure washing application comprising, in combination: (a) an outer, electrically insulating shroud having a liquid inlet port and a liquid outlet port; (b) an inner, single-wall, liquid impervious, motor housing having a hollow interior and generally concentrically disposed within said outer shroud and formed from a material exhibiting high thermal conductivity characteristics, said outer shroud and inner, single-wall motor housing being spaced to define an annular chamber therebetween and joined along a mating interface to seal said hollow interior; (c) electric motor means supported entirely within said hollow interior of said motor housing and totally isolated from liquid being pumped, said motor means having an output shaft; (d) a transmission housing integrally formed on the exterior of said inner housing and concentrically disposed about said output shaft of said motor; (e) speed reducing gear means disposed within said transmission housing and coupled to be driven by said output shaft of said motor; (f) gear pump means coupled to be driven by said speed reducing gear means at a speed which is substantially less than said output shaft of said motor, said gear pump means including a pumping chamber, an inlet port in fluid communication with said annular chamber and said pumping chamber and a pumping chamber outlet port in fluid communication with said pumping chamber; and (g) means for introducing a liquid to be pumped through said liquid inlet port in said shroud to flood said annular chamber while flowing said liquid through said inlet port of said gear pump means into said pumping chamber whereby heat produced by said electric motor is conducted through said inner motor housing and carried away by said liquid being pumped.